In accordance with Coast Guard Regulations (46 CFR), it is the duty of the Chief Engineer to acquire and seal a sample of fuel oil received whenever fuel oil bunkers are taken. This sample must be preserved until __________.

Correct Answer: Option A — that particular supply of oil is exhausted

MARPOL Annex VI and 46 CFR require the Chief Engineer to retain a representative fuel oil sample. This sample must be preserved under the vessel's control until the fuel is substantially consumed, ensuring evidence is available for potential quality disputes or regulatory investigations regarding fuel compliance throughout the voyage.